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Soru

Zorluk: OrtaInfectious Diseases

A 55-year-old man is evaluated in the hospital prior to discharge. Three days ago, he was admitted for a diabetic foot infection characterized by a 3-cm area of erythema, induration, and warmth surrounding a shallow, non-purulent ulcer on the plantar surface of his right foot. Upon admission, he was afebrile, and his vital signs were within normal limits. He was started on empiric intravenous vancomycin and piperacillin-tazobactam. Today, the erythema has decreased to 1 cm, and the patient is ambulating without difficulty. Deep tissue cultures obtained during initial debridement on admission have grown methicillin-susceptible Staphylococcus aureus (MSSA) and Streptococcus agalactiae. Susceptibility testing shows both isolates are sensitive to cefazolin, cephalexin, and amoxicillin-clavulanate. The patient is tolerating a regular diet. Which of the following is the most appropriate antibiotic regimen for this patient upon discharge?

  1. A
    Oral linezolid and oral amoxicillin-clavulanate
  2. B
    Oral moxifloxacin
  3. Oral cephalexinCevap
  4. D
    Intravenous cefepime
  5. E
    Intravenous vancomycin and oral ciprofloxacin

Cevap

Oral cephalexin
Oral cephalexin is the most appropriate next step because it provides targeted, narrow-spectrum coverage against the specific identified organisms (MSSA and Streptococcus agalactiae). The patient is clinically stable, recovering well, and tolerating a regular diet, which safely allows for the discontinuation of broad-spectrum intravenous therapy (vancomycin and piperacillin-tazobactam) in favor of a highly bioavailable, targeted oral agent.

Adım Adım Çözüm

1
Identify the patient's clinical status and trajectory.
The patient is clinically improving, hemodynamically stable, and tolerating oral intake.
This establishes that the patient is a safe candidate for transition from intravenous to oral antibiotic therapy.
2
Analyze the deep tissue culture and susceptibility data.
Cultures grew methicillin-susceptible Staphylococcus aureus (MSSA) and Streptococcus agalactiae, both of which are sensitive to first-generation cephalosporins.
Definitive culture data from deep tissue is the gold standard for guiding targeted therapy in diabetic foot infections.
3
Apply principles of antibiotic stewardship.
Select oral cephalexin to complete the treatment course.
De-escalating from broad-spectrum empiric therapy to the narrowest-spectrum, effective oral agent minimizes adverse effects, reduces healthcare costs, and prevents the emergence of antimicrobial resistance.

Anahtar Kavram

De-escalation of empiric broad-spectrum antibiotics to targeted, narrow-spectrum oral therapy based on clinical improvement and definitive culture susceptibilities.
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Infectious Diseases

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